Zinc was known to the Romans as the alloy brass, but it was not produced industrially until the mid-eighteenth century, and was not in common use on buildings until the nineteenth century. The cut surface tarnishes quickly to a light grey due to the formation of a patina of basic zinc carbonate. The metal is hard at ambient temperatures and brittle when cold. It should therefore not be worked at metal temperatures below 10°C without prior warming, and heavy impacts should not
Left-faced limber grounds fixed to substructure with hot-dip zinc-coaled steel screws into plugs
be used within the forming processes of bending and Table 5.12 Colour codes for grades of zinc folding.
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